Umicore

About: Umicore is a company organization based out in Brussels, Belgium. It is known for research contribution in the topics: Catalysis & Exhaust gas. The organization has 1253 authors who have published 1516 publications receiving 23358 citations. The organization is also known as: Union Miniere.

High density lithium cobalt oxide for rechargeable batteries

Abstract: The disclosure relates to positive electrode material used for Li-ion batteries, a precursor and process used for preparing such materials, and Li-ion battery using such material in its positive electrode. The disclosure describes a higher density LiCoO2 positive electrode material for lithium secondary batteries, with a specific surface area (BET) below 0.2 m2/g, and a volumetric median particle size (d50) of more than 15μm. This product has, improved specific capacity and rate-capability. Other embodiments of the disclosure are an aggregated Co (OH)2, which is used as a precursor, the electrode mix and the battery manufactured using abovementioned LiCoO2.

Architectural diesel oxidation catalyst for enhanced no2 generator

Abstract: A device is described which provides thermally durable NO2 generation in conjunction with efficient heat-up performance for filter regeneration, and low temperature HC (hydrocarbon) and CO activity. Importantly, it provides both functions while minimizing PGM (platinum group metals) utilization and its associated impact on catalyst cost.

Comparative study of structural properties and NOx storage-reduction behavior of Pt/Ba/CeO2 and Pt/Ba/Al2O3

Abstract: Differences in the NO x storage-reduction (NSR) behavior of Pt/Ba/CeO 2 and Pt/Ba/Al 2 O 3 have been identified and traced to their different chemical and structural properties. The results show that Pt/Ba/CeO 2 exhibits inferior NO x storage and, particularly, reduction (regeneration) activity compared to the Al 2 O 3 supported catalyst. The incomplete reduction of the stored NO x -species in Pt/Ba/CeO 2 seems to be caused by a faster and more profound reoxidation of Pt particles during the lean period as evidenced by in situ X-ray absorption spectroscopy. Interestingly, the reduction activity could be significantly improved by a pre-reduction step at mild conditions. Exposure of the Pt/Ba/CeO 2 catalyst to reducing H 2 atmosphere in the temperature range 300–500 °C lead to a moderate increase of Pt particle size which beneficially influenced the regeneration activity. In contrast, pre-reduction at temperatures above 500 °C was unfavorable and resulted in a severe decrease of the regeneration activity, probably due to migration of the partially reduced CeO 2 onto the surface of Pt particles.

Role of propane sultone as an additive to improve the performance of a lithium-rich cathode material at a high potential

Abstract: This study presents the use of 1,3-propane sultone (PS) in the [EC–DMC + 1 mol L−1 LiPF6] electrolyte as a protective additive for the Li-rich-NMC xLi2MnO3–(1 − x)LiMO2 (x ≫ 1; M = Ni, Co, Mn) cathode–electrolyte interface during cathode material activation and cycling at a high potential (5 V vs. Li). The results showed that the presence of 1% PS (w/w) ensured complete and better electrode activation during the first cycle than EC–DMC + 1 mol L−1 LiPF6. Thus, Li//Li-rich-NMC half-cell and Gr//Li-rich-NMC full-cell provided capacities as high as C = 330 mA h g−1 during charge and C = 275 mA h g−1 during discharge with a higher cut-off voltage of 5 V. Measurements by cyclic voltammetry demonstrated that activating at such a voltage enhanced the redox activity from Li2MnO3 activation. At same time, the contribution of nickel and cobalt electroactivity is decreased at their regular voltage. This feature was attributed to structural modifications occurring on the surface to the bulk of the material. Long-cycling tests of Li//Li-rich-NMC half-cells with PS provided a higher reversible capacity and superior capacity retention (245 mA h g−1 after 240 cycles) with good coulombic efficiency (99 ± 1%) and better high-discharge rate capability (above 180 mA h g−1 at 1 C regime) than those obtained using conventional electrolytes without additive.